rear end and front end diff
 

Im changing my diff fluids this weekend and was wondering how many quarts the front end holds and how much the rear end holds on my 99? Thanks.

They each hold about 1 bottle more than you'll buy at the time. Depending on your specific axle:
FRONT AXLE
Model 216-FBI 2.3 L (4.8 pts.)
Model 248-FBI 4.0L (8.5 pts.)
REAR AXLE
9-1/4 inch 2.1 L (4.5 pts.)
248-RBI(2WD) 3.0 L (6.3 pts.)
248-RBI(4WD) 3.4L (7.0 pts.)
267-RBI(2WD) 3.3 L (7.0 pts.)
267-RBI (4WD) 3.6L (7.5 pts.)
286-RBI (2WD) 3.2 L (6.8 pts.)
286-RBI (4WD) 4.8 L (10.1 pts.)

I always purchase extra, simply for spillage, etc. The cold fill capacity is usually 1/2" to 3/4" below the fill opening. I have know many people that fill until it's running out, and then their pinion seals are leaking 6 months later. There needs to be some room for expansion.

Do you have limited slip? If so, do several tight figure of 8 patterns in a parking lot to get the new fluid worked into the clutch packs. If chatter exsists after that, then get a bottle of friction modifier, and add a little at a time until the chatter stops. Good luck!

You don't list your tranny type.
Manuals - Dana 80 - 5 qts
Automatic - Dana 70 - 4 qts

Really depends on how much you get out first.

RJ